如题所述
第1个回答 2015-03-19
1.be helpful in doing sth. 对做某事有帮助
例如We hope this leaflet has been helpful in answering your questions.
我们希望这个宣传单可以帮助您找到您想要的答案
2.it is helpful (for sb) to do sth
It is helpful to discuss your problems with your friends.
-跟你的朋友们聊聊你遇到的问题是有好处的。这里的It是，真正的主语是to后面的句子
3.be helpful for sb对某人事有益的
例如;Music with the sounds of the ocean or bird song can be helpful for some.
大海的声音或者鸟叫声对你的睡眠时很有帮助的本回答被网友采纳
例如We hope this leaflet has been helpful in answering your questions.
我们希望这个宣传单可以帮助您找到您想要的答案
2.it is helpful (for sb) to do sth
It is helpful to discuss your problems with your friends.
-跟你的朋友们聊聊你遇到的问题是有好处的。这里的It是，真正的主语是to后面的句子
3.be helpful for sb对某人事有益的
例如;Music with the sounds of the ocean or bird song can be helpful for some.
大海的声音或者鸟叫声对你的睡眠时很有帮助的本回答被网友采纳
第2个回答 2015-03-19
be helpful to 对……有帮助
